| GE Li-Iing,LU Cai-hong,JING Xiao-tian,LU Zheng-xin,LIU Zhong-liang.Study on Microstructure and Properties of 40Cr Steel Surface Nanocrystallization[J],37(2):11-13 |
| Study on Microstructure and Properties of 40Cr Steel Surface Nanocrystallization |
| Received:December 13, 2007 Revised:April 10, 2008 |
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| DOI： |
| KeyWord:40Cr steel Supersonic fine particles bombarding Nanostructured surface layer Micro-hardness Wear resistance |
| Author | Institution |
| GE Li-Iing |
School of Materials Science and Engineering, Xi' an University of Technology, Xi' an , China |
| LU Cai-hong |
School of Materials Science and Engineering, Xi' an University of Technology, Xi' an , China |
| JING Xiao-tian |
School of Materials Science and Engineering, Xi' an University of Technology, Xi' an , China |
| LU Zheng-xin |
School of Materials Science and Engineering, Xi' an University of Technology, Xi' an , China |
| LIU Zhong-liang |
School of Materials Science and Engineering, Xi' an University of Technology, Xi' an , China |
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| Abstract: |
| By means of supersonic fine particles bombarding ( SFPB) , nanostructured surface layer was fabricated on 40Cr steel plate. The microstructure features of various sections in the surface layer were characterized by using XRD, TEM and optical microscope observation. The micro-hardness was measured by micro-hardness instrument. The result shows that after SFPB treatment, in the surface layer, nano-sized grains are observed and composed of ferrite and cementite phases, the the mean grain size in the surface layer is about 10 nm and the depth is about 40μm; The grain size increases depending upon distance from the treated surface. Experimental evidence and analysis indicate grain refinement could be mainly attributed to the movement of dislocation. The surface micro-hardness is increased t0 526HV, and decreases rapidly with the increase of the depth from the surface. At the same time, its wear resistance also is greatly improved. |
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